Sis the set of prime numbers that are less than 15 a. {2, 3, 5, 7, 11, 13} b.{2, 3, 5, 7, 9, 11, 13} c.{1, 3, 5, 7, 9, 11, 13} d.{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}

The answer is A. It is not B because 9 is the product of 3 x 3. It can't be C because 1 is only the product of 1 x 1.

42.4

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the surface area is 124cm²

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length: 4cm

width: 9cm

height:   2cm